Territory



UNITED STATES SMOKE-STACK FOR STEAM VESSELS.

Speccaton of Letters Patent No. 20,909, dated July 18, 1858.

To all whom t may concern.'

Be it known that I, IVILLIAM IVEBSTER, of Jefferson count-y, in the Territory of Vashington, have invented an Improved Smoke- Stack for Steam Vessels; and I do hereby declare the following to be a correct description of the same, reference being had to the accompanying drawings, in which- Figure 1, is a perspective view of the eX- terior of the smoke stack; and Fig. 2, a similar view, showing part of the shell of the stack removed to display the interior arrangement.

The same part is indicated in both figures by the same letter of reference.

The nature of my invention consists in the arrangement, hereinafter more particularly described, whereby I increase the draft, while diminishing the height of smoke stacks for steam vessels, keep the outer shell cool, exclude rain, and divert the heat and cinders from the masts, sails and rigging, substantially as hereinafter specied.

In the drawings, A marks the deck of the vessel; B, the outer shell of the stack; C, the revolving hood; D, D, D, D, the tubes connecting with similar tubes D', D, D, on the top of the furnace; E, E, braces to support the stack; F, F, chains for revolving the hood C; G, G, catches holding the hood in place; H, pivot-bearing of hood; I, rod on which the hood revolves; J, braces of hood; K, braces holding the tubes, D, in place; and supporting rod I; L, L, L &c. holes in bottom of shell B; M, sliding registers for covering holes L; N, N, eye bolts passing up through the flange of the shell; P, P, twyers or nozzles in the hood; R, hinge by which the stack is lowered when required.

Instead of allowing the expansion of the heated products of combustion to take place, immediately upon their leaving the furnace, into a large smoke stack, I conduct those products up through the pipes D, D, &c., and allow them to expand just below the top of the shell B. This is attended with a great increase of draft, which is still further enhanced by the admission of air through the holes L, L, which becomes heated by contact with tubes D, D, and, ascending, flows out of the mouth of the hood C. Coperating toward the same result, are the twyers P, P, P, &c., through which a rapid current of cold air is continually passing, creating a tendency to a vacuum in the tubes D, and shell B, which is counteracted by the upward flow of their contained air and gases.

The great increase of draft resulting from this combination of devices, enables me to decrease the height of the smoke stack-an object of great importance in war steamers, and not to be disregarded in other vessels, as it diminishes the risk of burning the sails, and rigging, and places any fire that may' occur more conveniently under control.

The safety of the masts, sails, and rigging, from the effects of the heat and cinders from the stack, is further secured by the hood C, which can be so turned as to send the current of heated air and cinders over the side of the vessel. The hood revolves on bearing H, at top of rod I, and its position is controlled by the chains F, by which it can be rotated from the deck at pleasure.

The shell, B, of the stack, is kept cool by the currents of cold air which enter at the holes L, L, &c., in the lower part of the shell. These holes are covered by slides, or registers, M, having corresponding holes in them. The quantity of air admitted through holes, L, can be regulated by these registers in the well known mode.

The hood, C, is held in placel by the catches Gr, G, attached to B; and the shell B is secured by braces E, E, attached to the deck of the vessel. It is further secured by keys run through the holes in bolts N, N, which project from the deck, and pass through the flange of the shell, as clearly shown in Fig'. l. This flange is hinged at R, so that, by releasing the braces E, E, and withdrawing the keys from the bolts N, the whole stack can be lowered upon deck whenever it may, for any purpose, become necessary.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is

1. The arrangement of two or more pipes D, D, D, &c. within an outer shell B as described.

2. The application to a double shell smoke stack, of the registers L, L, &c. as and for the purpose described.

The above specification signed and witnessed this fifth day of June A. D. 1858.

WM. WEBSTER.

INitnesses:

JNO. G. THOMPSON, CHAs. F. STANSBURY. 

